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Unread 03-21-2010, 05:23 PM   #1
lakailimited06
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1999 WJ 
 
Join Date: Sep 2007
Location: Long Island, NY
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4.0 very sluggish...normal?

i know with the 4.0 in the WJs you can't reall expect much power from it, but after today i think sometihng might be up...

i drove to CT with two buddies of mine an XJ on 33's with 4.10s and an XJ on33's with 4.56...now im on 31's with 4.10s and i had a very hard time keeping up with them...1st and 2nd my WJ will accelerate decent especially if i get on it but 3rd and 4th are like useless especially on the highway which was mostly what today consisted of...

every hill i came up to the WJ turned into a dog and couldnt get out of its own way...yes i could step on the pedal and launch in 3rd gear at about 3200 rpm but is that really necessary?

is there something i could look into that i wouldnt notice? i have a K&N intake and 2.25" pipe with a flowmaster and turndown and i know it doesnt do much but even with this my WJ is so laggy...

am i asking for too much or can something be up?

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Unread 03-21-2010, 05:33 PM   #2
ANGJetMech
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Mine is the same way. I've pretty much realized it was just a fact of life and dealt with it.
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Unread 03-21-2010, 05:36 PM   #3
fireman33
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Mine is totally like that right now with 3.55 gears though...4.56 are ordered already, hopefully it will give it a boost
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2003 WJ 4.0, 4'' IRO Critical Path, 31x10.5x15 goodyear wrangler territory on soft 8's, Tom Wood front drive shaft, Rough country SS, 4.56 G2 gears, D30 front, D35 rear/detroit trutrac, IRO adj. trackbar, Doetch tech 8000 shocks, nv242 TC, midland cb, 3' firefly antenna, Mopar TC Skid

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Unread 03-21-2010, 05:39 PM   #4
lakailimited06
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yea i definitely should have went with 4.56 especially since im getting 33's soon and my heavy rear bumper aint gona hellp
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Unread 03-21-2010, 05:46 PM   #5
ajmorell
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Doesn't seem too abnormal considering the WJ is so much heavier than the XJs
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Unread 03-21-2010, 05:47 PM   #6
fireman33
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I dont know how it feels with 4.10...i know it doesnt feel good at all with 3.55 and 32s but when looking at the gear ratio chart, i had 3.55 with 245 65 17 and now that i have 265 70 17 i would only need 3.87 of gears to bring the ratio back to where it was before...so hopefully with the 4.56 it will be a lot more peppy.

If you go up to 33s i would sell the 4.10 and get 4.56 for sure
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98% of Canadian say '' oh **** '' before taking the ditch in winter time. The other 2% are from New-Brunswick and say '' hold my beer and watch this ''

2003 WJ 4.0, 4'' IRO Critical Path, 31x10.5x15 goodyear wrangler territory on soft 8's, Tom Wood front drive shaft, Rough country SS, 4.56 G2 gears, D30 front, D35 rear/detroit trutrac, IRO adj. trackbar, Doetch tech 8000 shocks, nv242 TC, midland cb, 3' firefly antenna, Mopar TC Skid

My build thread--> http://www.jeepforum.com/forum/f197/...-build-957216/
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Unread 03-21-2010, 06:53 PM   #7
ajmorell
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Quote:
Originally Posted by fireman33 View Post
I dont know how it feels with 4.10...i know it doesnt feel good at all with 3.55 and 32s but when looking at the gear ratio chart, i had 3.55 with 245 65 17 and now that i have 265 70 17 i would only need 3.87 of gears to bring the ratio back to where it was before...so hopefully with the 4.56 it will be a lot more peppy.

If you go up to 33s i would sell the 4.10 and get 4.56 for sure
That's just to bring it back to the same final drive ratio. It doesn't account for the increased weight of the bigger tires.
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Unread 03-21-2010, 07:06 PM   #8
fireman33
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But it should still help in some way ?
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98% of Canadian say '' oh **** '' before taking the ditch in winter time. The other 2% are from New-Brunswick and say '' hold my beer and watch this ''

2003 WJ 4.0, 4'' IRO Critical Path, 31x10.5x15 goodyear wrangler territory on soft 8's, Tom Wood front drive shaft, Rough country SS, 4.56 G2 gears, D30 front, D35 rear/detroit trutrac, IRO adj. trackbar, Doetch tech 8000 shocks, nv242 TC, midland cb, 3' firefly antenna, Mopar TC Skid

My build thread--> http://www.jeepforum.com/forum/f197/...-build-957216/
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Unread 03-21-2010, 07:10 PM   #9
comptiger5000
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That's normal. With 245/70/16 and 3.73s, a 4.0 WJ can't maintain speed on a lot of hills on the highway without dropping to 3rd at 3000 rpm. They have good power until you run out 2nd gear (or hit 60 or so), then they fall flat on their face.
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Unread 03-21-2010, 07:50 PM   #10
ajmorell
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Quote:
Originally Posted by fireman33 View Post
But it should still help in some way ?
Yeah it will still make a difference
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Unread 03-22-2010, 07:46 AM   #11
92rslt1
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Quote:
Originally Posted by comptiger5000 View Post
That's normal. With 245/70/16 and 3.73s, a 4.0 WJ can't maintain speed on a lot of hills on the highway without dropping to 3rd at 3000 rpm. They have good power until you run out 2nd gear (or hit 60 or so), then they fall flat on their face.
LOL mine wont even shift into OD on the highway.
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Unread 03-22-2010, 11:26 AM   #12
CrazyIvan888
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Gotta remember that the XJs have a different tranny, maybe the AW4 is geared lower? Just a thought.
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